a)     ( 44 . 60 ) : ( 11 . 15 )

      = (44 : 11 ) . ( 60 : 15 )

      = 4 . 4

      =16

b)     2567 - ( 167 + 52 )

      = 2567 -167 - 52

      = 2400 - 52

      = 2348 

a)  ( 44 x 60 ) : ( 11 x 15 )

= 2640 : 165

= 16

b)  2567 - ( 167 + 52 )

= 2567 - 219

= 2348

a)29 . (19 – 13) – 19 . (29 – 13)

= 29 . 6 – 19 . 16

= 174 – 304

= –130.

b)31.(-18)+31.(-81)-31       

= 31. [-18 + (-81) - 1 ]

= 31. (-100)

= -3100

c)(7.3-3):(-6)  

(7.3-3):(-6)

= (21-3):(-6)

= 18 : (-6)

= 3

d)72:[(-6).2+4)]       

= 72 : ( -12 + 4 )

= 72 : -8

= -9

Bài 2:

a)(-12).47+(-12).52+(-12)       

= (-12).(47+52+1)

= -1200

b)13.(23+22)-3.(17+28)  

13 . (23 + 22) - 3 . (17 + 28)

= 13 . 45 - 3 . 45

= ( 13 - 3 ) . 45

= 10 . 45

= 450

c)18-10:(-2)-7   

= 18-5+7

= 13+7

= 20

d)99:[(-7).2+5)

a,(-19)+(-32)+2019+52 = -19 + 2019 + 52 - 32

                                     = 2000 + 20

                                     = 2020

b,34-(15+34-40)= 34 - 15 -34 + 40

                          = -15 + 40

                          = 25

c,-11.(-4)+6.(-5)= 44 + ( -30)

                         = 14

d,88.(12-67)-12.(88+67)= 88.12 - 5896 - 12.88 + 804

                                      = -5896 + 804

                                      = -5092

hok tốt!

a,(-19)+(-32)+2019+52

=(-19+2019)+(-32+52)

=2000+20

=2020

b,34-(15+34-40)

=34-15-34+40

=(34-34)-15+40

=0-15+40

=-15+40

=-25

c,-11.(-4)+6.(-5)

=44+(-30)

=14

d,88.(12-67)-12.(88+67)

=88.(-55)-12.155

=-4840-1860

=6700

a: 72-19+2021

=53+2021

=2074

b: \(6\cdot5^2-16:2^2\)

\(=6\cdot25-16:4\)

=150-4

=146

c: \(375:\left\lbrace32-\left\lbrack4+\left(5\cdot3^2-42\right)\right\rbrack\right\rbrace-14\)

=375:{32-[4+(5*9-42)]}-14

=375:{32-4-3}-14

=375:25-14

=15-14

=1

\(a,\dfrac{3}{5}+\dfrac{1}{5}.\dfrac{-17}{9}=\dfrac{3}{5}-\dfrac{17}{45}=\dfrac{27}{45}-\dfrac{17}{45}=\dfrac{10}{45}=\dfrac{2}{9}\\ b,\left(-\dfrac{4}{15}-\dfrac{18}{19}\right)-\left(\dfrac{20}{19}+\dfrac{11}{15}\right)=-\dfrac{4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=\left(-\dfrac{4}{15}-\dfrac{11}{15}\right)-\left(\dfrac{18}{19}+\dfrac{20}{19}\right)=-1-2=-3\)

\(a,=\dfrac{3}{5}+\left(-\dfrac{17}{45}\right)=\dfrac{2}{9}\)

\(b,=-\dfrac{4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=-3\)

a.2/9
b.-3

a.2/9 b.(-3)

a: \(17\cdot85+15\cdot17-120\)

\(=17\left(85+15\right)-120\)

=1700-120

=1580

b: \(2^3\cdot17-2^3\cdot14\)

\(=2^3\left(17-14\right)\)

\(=8\cdot3=24\)

c: \(20-\left\lbrack30-\frac{\left(5-1\right)^2}{2}\right\rbrack\)

\(=20-30+\frac{4^2}{2}\)

\(=-10+\frac{16}{2}=-10+8=-2\)

d: \(80-\left(4\cdot5^2-3\cdot2^2\right)\)

\(=80-\left(4\cdot25-3\cdot4\right)\)

=80-100+12

=92-100

=-8

e: \(27\cdot77+24\cdot27-27\)

\(=27\left(77+24-1\right)\)

\(=27\cdot100=2700\)

f: \(174:\left\lbrace2\cdot\left\lbrack36+\left(4^2-23\right)\right\rbrack\right\rbrace\)

\(=\frac{174}{2\cdot\left(36+16-23\right)}=\frac{87}{52-23}=\frac{87}{29}=3\)

số âm hả bn

=2012

=-4/15 - 18/19-20/19-11/15

= (-4/15-11/15) - (18/19+20/19)

= -1 - 2

= - 3

\(\left(\frac{-4}{15}-\frac{18}{19}\right)-\left(\frac{20}{19}+\frac{11}{15}\right)=\frac{-4}{15}-\frac{18}{19}-\frac{20}{19}-\frac{11}{15}\)

\(=\left(\frac{-4}{15}-\frac{11}{15}\right)-\left(\frac{18}{19}+\frac{20}{19}\right)=\frac{-15}{15}-\frac{38}{19}=-1-2=-3\)

a,( -137 ) + (+52) . (-137) + (-137) . (+47)

<=> ( - 137 ) . 1 + 52 . ( - 137 ) + ( - 137 ) . 47

<=> ( - 137 ) . ( 1 + 52 + 47 )

<=> -137 . 100

<=> - 13700

b,-135 + 135 . ( -19 ) - 80 . 135

<=>-135 + 135 . ( -19 ) + ( -80 ) . 135

<=>-135 . 1 + 135 . ( -19 ) + ( -80 ) . 135

<=>-135 .[ ( -19 ) + ( - 80 ) + 1 ]

<=>-135.(-100)

<=>-13500